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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04e33dbd2814892c7e465e0277ab7a07b8bb0495fec7ee926bd7cf7e318d532' 
  AND token = 'AbFSDZR+sYD4Ifr14RXSkUr6cA7Kj7m2+kbi5S0AieM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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