SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac491d250739590df46c87769ec39b8064088135bcc4eda384721b423483a315' 
  AND token = 'MLBUoZ87K/EePvg2Km1qnxK7+9uEMLQHpj7nrfwa14U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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