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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c4cb5025274b35803666d47d779344ea481e3ccdcd2cff91c3f5a089d215cb' 
  AND token = '/QAF15CG+/IRt0jczUVFrcq1GAJ2zrR63pfv9JydIy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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