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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca1ec1c6c1b4be7938040ae33ce44c050a3dd6a6b59de6342e4c89b50ce28b3' 
  AND token = 'y5gJMQof3Ouz53cFoBq/3zFVqkIWknB4RGndz6kKcxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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