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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c39ae0d7bb8ac6db5d621c3465c743a11088e5fce84741072c58f4732c69a71' 
  AND token = 'PcNpwm32f/8mKLIBSimTWXLEdq3AXCyUlnsdCyjWF6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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