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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0d7f42a9756105e1ac5d0af344e8d29588b65350df7b8e8eca4ae4d8368b2f' 
  AND token = 'jWOw0ReWKgqg3N4KJk5dGl/kmGRlR0MZnI/L7cgo7gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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