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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409907d03e01df5f913fc034cb523177d89991b3c691e6a4391d917b795619c0' 
  AND token = 'V3ozE23IN2YrZI2P4cB2O1hbwUDRLsnjXKSeogpIDYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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