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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c750b6120758e15b982e0302c5d096e62a15a7c1b3f6192fe94fe6b37c74bd92' 
  AND token = 'OjAyLS57eHYFkbRUjHCeKK+rurOacoRvXlxq5nVbtNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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