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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c635c314e792c1bf2c33be6c5d809274d2cc7edbeb7588e24bee82d0f7d61d5' 
  AND token = 'P0spc7/sN+zxry/Dp+JCbzAq21TjzDZ/9f6Xfia1ccA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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