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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b7175f244d71b0c35618de3f55488113d6d995bcc47ec8a579786494beddcc' 
  AND token = '4Mqr+CLiXhLA7XUEb2EUu/285+7cbGgHJvNU215RWhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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