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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c25fda98014cf7242a8f895bf9e0c048208a2c1239c70f61724f36f6523a3d' 
  AND token = 'd7+V1cJ5XrynXf3nUZ6l4uPyiazbyYzYnnhfV0gLFes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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