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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e2ad50d0d92f11692b1c7ef0433969ab4bf69f83d43da9e2e6a6f98dcb9389' 
  AND token = 'aUu4LHBxr+RXDPOzTeU5ZO59zD3A6Sx6KN69N2sHVp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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