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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d8cb692dba1e95fb5becd430a883f0520a29d90730f31b5e65abbcd8aabbeb' 
  AND token = 'FYxSwWkSuRb4HMXvnO23D7qEE4dPq5604MeZnXfnAco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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