SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62696a951a65a9351fe3d4c900d24802dbc1529a325985074138774ad9844362' 
  AND token = 'FGOIUYZhdKHNwH1O4v3tK4OyJPMXDWnglDHifC2Eukw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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