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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45d677ec71eb0e8c6c9f4c099d59651d092ad7da7897f893f9fc678554f2890' 
  AND token = 'HpizdLis/rT6qJY6QUPWfPmaDIS8dgLrV0og2tD80PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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