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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9b94a339b3df017fcdc56f80982ae50c76c9344524d40b0e9a0f318b1ed904' 
  AND token = 'vFHRK9nMjSdniA5JPs96ghu8VprD+W57RJwnpchmTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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