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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c762b144192f002e409e36ee37344277745e83a356393c5f4664ec6e3e1eb1' 
  AND token = 'huev2QR1mh/IbFr4wBT+gepXQQsbrfqqL4J4NxQcfdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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