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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b903405e4f02688bb6b5da0c0c08d0e1a6d512dd937f22f97f2c926dff03dad' 
  AND token = '2okDvd4L+T1ea6StJ6SbIjbTkShab0ZAWtRivCsHQmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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