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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8561477ec7da502c5af11bb8f747c943fd6650cc2884828f7b3d04dd5e3faf' 
  AND token = '9qS9/SVRB/Na/eji9O1FLFudWW+WGw3G45MR7BEeZc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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