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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd19e6fd31363f1f02397a85ba9dd05b43315540f2b9b675ccb0ade9955729b2' 
  AND token = 'HpquRmsTH9nP5JwJgkajDO4Syn8fAw6VCwUZS4nQXJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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