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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272d14e4b72c3077b99f9c422fe01de9f2ed40aeb9aa5d9335ee0e12b8d638bf' 
  AND token = 'whiFz9zumpzbxEsZZIzAHpNO21WyBKzFoXDq4pGz4oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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