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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fdf03bfb98d3886c5827ddf54ab74a8225c916f28e37d90ee739d16e6cdd50' 
  AND token = 'Ak9Dw8zBaAbNiQpw3WDhs15tzsfPcUlLjg/Wb/b8Mi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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