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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1218be30ce4860151870d0594cf71a6ea57e200810e76f5e8b592a2bd30f1196' 
  AND token = 'MjpiF+St/SO77DzPKIrFidVwUWXgtF/PrGOjMDznO4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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