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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a68dc76fa4971b8d537eafbc2ffec6e52f39c17e5ec5fecce6325a1fb36cf1b' 
  AND token = 'C5XoMxec3BeBME4ME8FoQcMojoIteuxg5PmhRbMijjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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