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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767bc7e3e49cc6c4b34338ce1e90bc58c6e46161c502b0501dd276033e4c0492' 
  AND token = 'sN7286OsEldZN/y1mZDi9UY88ACTgZo0Xxi9Ka3tmCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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