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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d0b0e215e56ddd4a7bf3599365dafc66d960b002911c8f00ae5a4111b3dfac' 
  AND token = 'dQkX61c8rqAEV0kHIoOaIPaedYIOioIyzzWNVJLP9Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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