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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83af9a6a22e490d5f343f0649b81118acdf96f19959d43b3190d5493fea7350' 
  AND token = 'kxIzqxDrq/LkY7x/pdZubzCwrc2Zs0WMgokPdyQQxZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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