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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baef37dd9501363dc88fbb95d862d42c3aa179de19748fccc739944cde8d2697' 
  AND token = 'RWJCo2hBjamDCTstcXylUmjzf1jB3yTX0mSVjglCAf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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