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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9424bdc8be9ed030a133d9b93e7fb5ba3ccbe70d74d31e6784ba5bd6e82df8fd' 
  AND token = 'SInBMpiSpJvgj2vUZK3REQXRQT2dhK23RKMeXh24JbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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