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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7963c8bd8323749430709866893fbf8f9d888d4067a40280ab19fd82d41ff114' 
  AND token = 'w7DJg2dOvkm4A3oBJ1emYhMghngdmTAXV/IT4MX7guA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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