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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26dcaf9f1e39e8118ccabd934f3ce9e1c4c937c5738ef704f840fd5a7ee1229' 
  AND token = 'oEhzHM4BdZbHx8cdKlMJV56DdPAC6KsqX0ol+VHWRgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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