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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6806e5742f18ed12215951a9818a27b7019173b31d1f65b5de45ef010fb710b' 
  AND token = 'gzsXUKrMx4qhffAaUc7GKky9BxNfWeDRX6Qjren405I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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