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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85b26f89266b18ce4c17d16f95b6c84b51c9edfd980eb263de3334762caa595' 
  AND token = 'RqvjILpksYKRCWqcJmL8s4iiYn6Jvb5Io4DSIxHw6R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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