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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7128dbef330f3a8511d312b80a4a948b80a543c4e42e18f73c7ec4965ae8dafd' 
  AND token = 'Mg5kY2LnmC0lbAjnLMTBxqjdYRX5XGT62xpu0wzdJ+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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