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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3be000fa62d811435448099ec11ae6ae6461b6fa5b21553042ca198b4999b9' 
  AND token = 'jzsIzeAOvU5fixTXv7278rg6LLsRnCLpix3xBK2hkDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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