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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fd6c2f1b63e883a4fdc83a86d2b26cacb717c6a99dd432ecf9ed8ac7584db1' 
  AND token = '50h3TZ3z5gjAS1Cihf2g48h+ZlW5UICgpx1d4kNqNM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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