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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40ec9fa4b5cf3ec2126e093652501a2dcb965816694ee5aa6f58f07e4d3dfce' 
  AND token = 'p+j6VK8mMqrjeMWERMnI3NCfZepxCgq6xV9Hr3VLD+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}