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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20423e09ed13ee5ed2cb312b673732d38078718181fb239a3b7b8c2ec9937bf' 
  AND token = 'FnYgP/ioHMqYxoq1jO+wCUG9NRw1htt9cazv300W3PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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