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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98639c77ae7de642ea1161dfa6271611477988b7c9af240dc163d5f96874d13' 
  AND token = 'B/+rZ6WJBCZi6Wq01CkX/OZeqsJMIvwEV/bxJiIoO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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