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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8874efa7e49d6d6bcc153de237e10f83f3bd9a5b64e7df1c67b902bf7ef99fa' 
  AND token = 'U5N3lv8ZIv4fD2ohPl4U+4EY6r+KYCA18taJd2PxsEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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