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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbebed3a492902c9db6a66e01e06bed992dbf6cd19e9e043c7769d53ce442429' 
  AND token = 'nDThXYfClVYePQyuB5uo3D7I6tlIlZc5jv+utQr7JbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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