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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb0a94122d6ff62bd50f9fb9bf8145648c5600b850bd669efdedc09dfe34669' 
  AND token = 'HJf8XVzY3sBG/0RjMQoxh/SDB0wRVPNAeRbLjziDjLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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