SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e70963f3d30e89d73cf87d94813ee5dd41f2f12a4441ef2abf45ee0c1c48e75' 
  AND token = 'hbxFdjN/LrufnAwPHodJRBO3KG8/ezrmISgCbX16Zwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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