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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33df33a448445268df51c0bf9331a431a7bdcf00172dd2a3c8321d1192ebf7a9' 
  AND token = 'ljRU44p58OkGCYsG5wYWsB9+NpTdrp9uuHgnVIvuyd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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