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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88577f450efaba956635a3fcdd6ec33b077f21e8ec61bab498eb6598038dc30d' 
  AND token = 'xZeljAgOnv9xoX3h7HShyEgmIU6GDku1878eitK6AEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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