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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c87cd2cd9f174f410e9462291109c46b6b92f1278d08f38878510efce432e7' 
  AND token = 'JfFRhAS8lUWbLepbdjoBVrW6KLWTHK1Wmkcix+QWCVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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