Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad31b97ca410f77729966ba0bed5e4d2dcb6b60c1d4d1e1086e3313f3dfe26dc' 
  AND token = 'N2zuVRaWIdu5CTQdPHakP2bQ+aE2mlSoNGIFRwMMXac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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