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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e36ac1ae8ede9804c63309e71c2bc98f5addee19030ff7f7056223d9551915d' 
  AND token = '1nczd8G3AlHOE4eH5dgT7dPyjholwQhnnQETvMgHOPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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