SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca70d56edbd7f51c3ba491d402ae7f4379ca44250815a2e8720bcd8c449683d9' 
  AND token = 'Wgr6ImEGPYThX+90B+JBa/Y1FfOWB6O2OMdleJ8pbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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