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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae9e7ff53ddace1c722b4ab63e824b55c0a2097bba5427afaf85126434a1e98' 
  AND token = 'NNUkfOLUj8bcBKRb3hHEbEUenFsjvYnO5TO0SZH+XDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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