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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3188df20c664ee26e293774e47dd04b029ae6c512722e292695036f4462910' 
  AND token = 'nm2810O+R8M/Bsm23lwOVe6JMV9DZquAtjLpd+HZuhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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