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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15259374e6eccb9c4140404e9a48d62a454960e5a83f8f53a8876894a3cc2d7' 
  AND token = 'bhWCeJiKKG5c99xrBx6Nj/TFhnsh++oGXIXm0dS3TII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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