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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2bf8d67ce334f8d407ac1b16abdf45c8c90707f7eba333023ee366223b17c4' 
  AND token = '0ewotPjrkub2+qYXDymfYUP6XrNG0WG/uA8GwjcmEzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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