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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90d457c60f1afc97b96c5fd61bcc06cc4b933d9de2dbc49ea92468ebb203617' 
  AND token = 'LB7Z4p/udQwZ4v90AyY9i85DWIGTozHM5F2vAsuikxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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