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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a211829bb1c0419d9aa9dfcfea3b7004da395cf9b3f83cfe2cb246c3dbea6cb' 
  AND token = '4HurxlOHN8YOjQxsakqXEzyJ5S5IajLm422k1WHjY5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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