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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df791529c4e9296e621234fad9de6ad3dcb7072ac9c9eb21f73212b7216e33d' 
  AND token = '7PkS/VviLfZyhJSYGmQ5ViCeVHi3NIE6+dln/DNiJ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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