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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8c457aec51353beae8ff5cb36253f7bf53b513123b4978a2fcab0172724ca8' 
  AND token = 'wyTMGM7TCsyspVlDL5BnbFrlVc9aV7kY9RRSu1bXscQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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