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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa33ade235491fbc876e689cc0d06c572fb2a67a5749252280115ead1ba3da3' 
  AND token = 'BcUL3m1IUWhWnqJmoyQVw8J+FKfqDqI1sSmGbAEo5U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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